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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Allowance for doubtful receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful receivables
Receivable from Sinosure recorded in prepaid expenses and other current assets	$ 9	$ 409

X

- Definition

Represents the amount of receivable from China Export & Credit Insurance Corporation recorded in prepaid expenses and other current assets.

+ References

No definition available.

+ Details

Name:	csiq_InsuranceForBadDebtLossReceivableCurrent
Namespace Prefix:	csiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableGrossAllowanceAndNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration